Case Study on the Solvent Extraction of Rice Bran Oil using d-Limonene, a-Pinene, and p-Cymene as Alternative Green Solvents for n-Hexane

Author : Artieda, Ian Jeffrey Soriano
Major Adviser : Detras, Monet Concepcion M.
Major Co-Adviser : Gummert, Martin
Committee Members : Migo-Sumagang, Maria Victoria P.; Migo, Veronica P.
Year : 2020
Month : July
Type : Thesis
Degree: BS
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Though commonly used in feeds, rice bran has high amounts of nutrients due to the components of its oil. The most common technology used for the isolation of rice bran oil is solvent extraction. Hexane has been widely used for rice bran oil extraction due to high oil yield, and simple recovery. However, the use of hexane has proven to have adverse effect to the environment, health, and safety. Green solvents are derivatives from natural resources which have good solvent properties but are non-toxic and eco-friendly. Example of these solvents are terpenes. In this study, the status and challenges of the rice bran production will be addressed specially using solvent extraction. Furthermore, the use of terpenes d-limonene, a-pinene, and p-cymene will be compared with n-hexane to determine its feasibility as a greener alternative in the solvent extraction of rice bran oil. Lastly, the potential rice bran oil production of the Philippines will be evaluated using the best green solvent. The terpenes are shown to be a promising alternative to n-hexane specially d-limonene which could yield 23.52 % more oil than n-hexane. The potential large-scale rice bran oil production could reach 361,800 million tons of refined oil with price of P74.06 per L. Membrane separation using nanofiltration is a good solution to high energy demand of recovery of d-limonene which could save 46.89% compared to its evaporation.

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